I have a BME that is acting up, and wanted to know if anyone has encountered the same problem.

Crank the engine, run it up. All is well. pull it back to idle. Let it set for a while. Sometimes, you don't have to wait, it starts to slow down. Open the throttle (yes, I verified that the throttle actually opens) and nothing happens. it just sits there, barely able to idle, like it loaded up or something. after a long pause (~5 sec) it accelerates like it should. Sometimes it will not spin up, but rather just slow down to death. It will run all day on full throttle.

I have adjusted the low speed screw way in, and way out. No change. Got any ideas?